Microphone system with non-orthogonally mounted microphone die

• US 9,226,052 B2
• Filed: 01/22/2013
• Issued: 12/29/2015
• Est. Priority Date: 01/22/2013
• Status: Active Grant

• Current Assignee: Invensense Incorporated (TDK Corporation)
• Original Assignee: Invensense Incorporated (TDK Corporation)
• Inventors: Khenkin, Aleksey S., Venkatadri, Vikram, Bolognia, David
• Primary Examiner(s): Eason, Matthew
• Assistant Examiner(s): Nguyen, Sean H
• Application Number:
  US13/746,488
• Publication Number:
  US 20140205127A1
• Time in Patent Office: 1,071 Days
• Field of Search: 381/355
• US Class Current: 1/1
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H04R 1/00 Details of transducers, loudspeakers or microphones
• CPC Class Codes: H04R 1/04 Structural association of microphone with electric circuitry therefor in deaf-aid sets H04R25/00
• CPC Class Codes: H04R 1/083 Special constructions of mouthpieces
• CPC Class Codes: H04R 1/326 for microphones H04R1/34 and H04R1/40 take precedence
• CPC Class Codes: H04R 11/04 Microphones
• CPC Class Codes: H04R 17/02 Microphones
• CPC Class Codes: H04R 21/02 Microphones
• CPC Class Codes: H04R 2201/003 Mems transducers or their use of the electrostatic type H04R19/005
• CPC Class Codes: H04R 9/08 Microphones

Abstract

A microphone system has a lid coupled with a base to form a package with an interior chamber. The package has a top, a bottom, and a plurality of sides, and at least one of those sides has a portion with a substantially planar surface forming an opening for receiving an acoustic signal. The microphone system also has a microphone die positioned within the interior chamber. The microphone is positioned at a non-orthogonal, non-zero angle with regard to the opening in the at least one side.

Claims

1. A microphone system comprising:

a base having a primary portion and a ramped portion, the ramped portion forming an obtuse angle “

OB”

with the primary portion and having a channel;

a lid coupled with the base to form a package with an interior chamber, the package having a top, a bottom, and a plurality of sides;

a microphone die positioned within the interior chamber, and being secured to the ramped portion;

at least one of the sides having a portion with a substantially planar surface forming an opening for receiving an acoustic signal, the channel being acoustically coupled with the opening and guiding the acoustic signal therethrough, the acoustic signal making contact with the microphone die orthogonally;

the microphone die being positioned at a non-orthogonal, non-zero angle with regard to the opening in the at least one side.

2. The microphone system as defined by claim 1 wherein the microphone die has a diaphragm, the channel further comprising a contour that is configured to direct the acoustic signal in a direction that is substantially orthogonal to the diaphragm.

3. The microphone system as defined by claim 1 further comprising a substrate secured with the base, the substrate supporting a circuit die.

4. The microphone system as defined by claim 3 further comprising a wire bond electrically connecting the microphone die with the circuit die.

5. The microphone system as defined by claim 1 wherein the base includes at least one location protrusion, the at least one location protrusion being positioned adjacent to the lid.

6. The microphone system as defined by claim 1 further comprising a device housing configured for connection with a person'"'"'s ear, a speaker within the housing, and controls for controlling the microphone die and speaker.

7. The microphone system as defined by claim 1 wherein one or both of the base and lid include injection molded material and conductive material to mitigate electromagnetic interference.

8. The microphone system as defined by claim 1 wherein the package has a plurality of external side faces, the microphone die being positioned at a non-orthogonal, non-zero angle with regard to the plurality of external side faces.

9. A microphone system comprising:

a base having a primary portion and a ramped portion, the ramped portion forming an obtuse angle “

OB”

with the primary portion and having a channel;

a lid coupled with the base to form a package having an interior chamber, the package having a plurality of exterior sides that together form a generally rectangular exterior shape;

an opening formed through one of the exterior sides of the package and responsive to an acoustic signal, the opening acoustically coupling the interior chamber with the exterior of the package; and

a MEMS microphone die mounted within the interior chamber the MEMS microphone die being mounted within the interior chamber at a non-orthogonal, non-zero angle to the opening and secured to the ramped portion, the channel guiding the acoustic signal therethrough, the acoustic signal making contact with the MEMS microphone die orthogonally.

10. The microphone system as defined by claim 9 further comprising a substrate secured with the base, the substrate supporting a circuit die in electrical communication with the MEMS microphone die.

11. The microphone system as defined by claim 10 further comprising a wire bond electrically connecting the MEMS microphone die with the circuit die.

12. The microphone system as defined by claim 10 wherein the substrate extends to the exterior of the package, the substrate having a first pad for surface mounting with an external device, the substrate having a second pad for electrically connecting with the circuit die within the interior chamber.

13. A method of forming a microphone system, the method comprising:

providing a base having a primary portion and a ramped portion, the ramped portion forming an obtuse angle “

OB”

with the primary portion and having a channel;

providing a lid;

securing a microphone die to one of the ramped portion of the base and the lid; and

securing the base to the lid to form a package having an interior chamber containing the microphone die, the package having a plurality of exterior sides that together form a generally rectangular exterior shape,

at least one of the plurality of exterior sides forming an opening for receiving an acoustic signal into the interior chamber,

the microphone die being positioned within the interior chamber at a non-orthogonal, non-zero angle to at least one of the exterior sides,

the channel guiding the acoustic signal therethrough, the acoustic signal making contact with the microphone die orthogonally.

14. The method as defined by claim 13 wherein the base includes a plurality of location protrusions, the lid having a top wall and a plurality of side walls extending from the top wall, securing comprising positioning the side walls around the plurality of location protrusions to locate the location protrusions within the interior chamber.

15. The method as defined by claim 13 further comprising securing a substrate to the base, the substrate extending from within the interior chamber and exterior to the interior chamber, the method also securing a circuit die to the substrate.

16. The method as defined by claim 13 wherein the lid comprises plastic and a layer of metal material to mitigate electromagnetic interference.

17. The method as defined by claim 13 further comprising mounting a circuit die within the interior chamber, the method further securing a wire bond to the microphone die to electrically connect the microphone die with the circuit die.